Thread:GODLIKEUndertaker/@comment-24053170-20191017074408/@comment-24053170-20191017183631

Please read about cameo appearances on wikipedia and tv tropes.

Because that isn't one.

That is more of a sticker from another series posted on a book, which would never be considered to be a cameo appearance in any form.

Its like a keychain of a character from a different show, series or franchise appearing on someone's bag, its not a background event, its not a cameo, its not a walk on/walk off, its not a one-scene wonder.

Its just a reference, nothing more. So unless you find an actual example of Ikaros or Astraea appearing as themselves in a background event, one-scene wonder or walk on role, then your trivia is not factual.